Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Back-rest having two oval shaped shells each concave to vertical and convex to horizontal
5195804 Back-rest having two oval shaped shells each concave to vertical and convex to horizontal
Patent Drawings:Drawing: 5195804-2    
« 1 »

(1 images)

Inventor: Stolle, et al.
Date Issued: March 23, 1993
Application: 07/466,349
Filed: March 6, 1990
Inventors: Brunig; Matthias (Hamburg 65, DE)
Stolle; Herbert D. (Hamburg 70, DE)
Assignee:
Primary Examiner: Dorner; Kenneth J.
Assistant Examiner: Gardner; James M.
Attorney Or Agent: Davis; David L.
U.S. Class: 297/301.1; 297/452.33; 297/452.34
Field Of Search: 297/460; 297/296; 297/312; 297/353; 297/354; 297/306; 297/300; 297/297; 297/298; 297/284R; 297/284B; 297/284C; 297/284G
International Class:
U.S Patent Documents: 256711; 371402; 1011026; 1976326; 2117821; 2796920; 2847062; 2858876; 2970638; 3063752; 4471993
Foreign Patent Documents: 0018423; 1121944; 1264703; 1282264; 2049666; 2123081; 1383559; 809095; 925337; WO860138
Other References:









Abstract: A backrest for stools, seats, chairs, and the like, characterized by two backrest shells (1) that are arranged at the sides and are configured in the manner of the contact surfaces of equestrian saddles, these being configured so as to be concave with reference to an axis that is essentially perpendicular to the seating surface (20), and so as to be convex with reference to a horizontal axis above the seating surface (20).
Claim: We claim:

1. Backrest characterized by two backrest shells (1), the shells being laterally spaced and configured so as to be substantially oval-shaped and elongated in the vertical direction whenviewed in elevation as well as being concave with respect to an axis vertical to a seat surface (20) and convex with respect to a transverse horizontal axis arranged above the seat surface (20) a transverse rail (3), and means for resiliently connectingeach backrest shells to each be rotatable about so as to enable said backrest shells to each be rotatable about three spatial axes.

2. Backrest as defined in claim 1 further characterized in that for each of the backrest shells, said resilient connecting means includes a spring element (5) extending from said transverse rail to a central portion of the backrest shell.

3. Backrest as defined in claim 2 further characterized in that said spring element comprises a cylinder formed of rubberlike material.

4. Backrest as defined in claim 1 further characterized in that for each of the backrest shells, said resilient connecting means includes a spring rod (2) having its ends connected to the upper and lower ends of the backrest shell and anintermediate portion connected to the transverse rail.

5. Backrest as defined in claim 1 further characterized by a substantially vertically oriented pad (6) positioned proximate the backrest shells.
Description: BACKGROUND OF THE INVENTION

The present invention relates to a backrest for a chair, seat, stool, or the like.

Backrests for chairs, automobile seats, and the like that incorporate side pieces that fit beneath the armpits and thus support the spine are known (DE-PS 12 82 264). Such seats can also be configured as folding seats when they are used inautomobiles (DE-OS 20 49 666), such seats automatically deploying when sat upon. None of these backrests have been accepted because they were to costly to produce and they did not off the required degree of comfort.

It is the task of the present invention to configure a backrest so that the spine of a seat person is effectively relieved of stress, this taking place both in the case of longer periods when seated in changing positions and also when widelydiffering physical characteristics of the individuals using the seats are involved.

SUMMARY OF THE INVENTION

The invention provides a backrest for stools, seats, chairs, and the like, characterized by two backrest shells that are laterally spaced and are configured in the manner of the contact surfaces of equestrian saddles, so as to be horizontallyconcave and vertically convex towards the front, a spring element being secured between a support rail and each backrest shell so as to provide a positive connection.

The underlying concept of the present invention lies in the special configuration of the seat shells. A configuration of this kind means that despite varying physical characteristics, persons using the seat are always supported, which is ofparticular importance in the case of automobile seating, since lateral forces must also be accommodated by the backrest, and this can be done in an anatomically effective manner by the backrest according to the present invention, so that the pelvic andlumbar regions are relieved of stress.

The present invention proposes a backrest that, in addition to being simple to produce, also offers a high level of comfort and adequate support for the spine. In addition, this backrest adapts to the physical dimensions of various users.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is described in greater detail below on the basis of the drawings appended hereto. These show the following:

FIG. 1 A side view of a backrest according to the present invention.

FIG. 2 A rear view of the backrest shown in FIG. 1.

FIG. 3 A cross section on the line A-B in FIG. 2.

FIG. 4 A perspective rear view of a part of a modified embodiment of a backrest according to the present invention.

DETAILED DESCRIPTION

The backrest consists of two backrest shells 1 (FIGS. 1 to 3), that are held by a spring rod 2 through carrier rails 3 and 4. These shells are shaped so as to be concave to the body around the vertical axis (FIG. 3), whereas they are convexabout a transverse horizontal axis (FIG. 1). In other words, the shells are horizontally concave and vertically convex towards the front side. Each spring rod 2 is connected at or near its midpoint with a retaining or transverse rod 3 so as to form ashape-locking fit. The transverse rail 3 can, optionally, be connected to a vertical carrier rail 4 of a chair so as to be adjustable in height.

In order to provide for greater comfort, there can be a pad 6 fitted in front of or behind the backrest shells 1; if this pad is fitted behind the shells 1, it is preferred that it be attached elastically to the spring rods 2.

When the user leans back against the backrest, there backrest shells fold under the ribcage and the armpits of the person who is seated, thereby supporting the spine. The backrest shells can, however, rotate about the horizontal axis, if theuser wishes to lean right back. In this case, the spring rods 2 are stressed so as to flex. A lateral elastic flexing of the backrest shells 1 is also possible, when an elastic lengthening of the spring rods 2 that is coupled with flexing at the pointof attachment also takes place.

A similar mobility can be achieved if one connects the backrest shells to the transverse rod 3 only with rubber cylinders 5 (FIG. 4).

Accordingly, there have been disclosed improved backrests. It is understood that the above-described embodiments are merely illustrative of the application of the principles of this invention. Numerous other embodiments maybe devised by thoseskilled in the art without departing from the spirit and scope of this invention, as defined by the appended claims.

* * * * *
 
 
  Recently Added Patents
Method and system for the assignment of security group information using a proxy
Financial transaction cards
Enediyne compounds, conjugates thereof, and uses and methods therefor
Multi-dimensional credibility scoring
Laminar library screen
Heating pad
Soybean variety XB51J12
  Randomly Featured Patents
Fuel additive compositions containing a mannich condensation product, a poly(oxyalkylene) monool, a polyolefin, and a carboxylic acid
Unsymmetrically linked bisnaphthalimides as antitumor agents
Laser diode with ridge waveguide structure and method for manufacturing the same
Urea derivatives as integrin .alpha.4 antagonists
Limitation of power dissipation in Li battery
Tire jack
System and method for identifying a user by grading a digital representation of an analogue form entered by the user
Apparatus and method for forming inflated chambers
Enhancement of optical and mechanical properties in a polymeric optical element by annealing under a compressed gas
Method and apparatus for inspecting hot hollow articles that are translucent or transparent